Men lose interest in me quickly. What am I doing?

Several short connections can leave a discouraging pattern, but their duration cannot tell you that you were too available or not interesting enough. Each ending may involve different expectations, circumstances or compatibility.

The part you can examine is what you wanted, how early that became clear and whether the actual contact suited you. Stating your pace and intention can help reveal a mismatch earlier; it is not a technique for making someone stay.